Occupational COPD among Danish never-smokers: a population-based study.

Occupational exposures have been shown to be risk factors for chronic obstructive pulmonary disease (COPD) among never-smokers. In a Danish population-based cohort, we analysed this association and the population attributable fraction. The study population (N=1575) was aged 45-84, COPD was defined by lung function measurements and the method of lower limit of normal (LLN), and occupational exposure was assessed by questionnaire and expert judgement. Furthermore, the estimates additionally were provided according to the Global Initiative for Chronic Obstructive Lung Diseases. More than a threefold increased risk (LLN OR=3.69 (95% CI 1.36 to 10.04) was found for occupational exposure to vapour, gas, dust and fumes (predominantly organic dust) in this never-smoking population, with a corresponding 48% (95% CI 30% to 65%) population attributable fraction among never-smokers. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.